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Forum: Cloud Computing

2021-11-17, 15:06

Replies: 68

Sticky: How-to guide for running LL tests on the Amazon EC2 cloud

Views: 34,842

Posted By drkirkby

Are you using the same CPUs as I had - 2 x Intel...

Are you using the same CPUs as I had - 2 x Intel Xeon Platinum 8275CL CPU @ 3.00GHz? The c5.metal does not specify the CPU type.

Amazon AWS seems to use some odd CPUs, which makes them difficult...

Forum: Miscellaneous Math

2021-09-04, 23:19

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

I'm not sure how you define efficiency. But...

I'm not sure how you define efficiency. But rather than make assumptions about suitable values of B1 and B2, why not let Prime95 determine them for you? It will know the trial-factoring that has...

Forum: Miscellaneous Math

2021-08-24, 23:14

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

Most commonly people would associate one with...

Most commonly people would associate one with being on, and zero being off. I have seen some mains power switches with just 1 & 0 on them. I guess it is more obvious than on/off if someone doesn’t...

Forum: Miscellaneous Math

2021-08-24, 21:52

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

All primes are equal, but some primes are more...

All primes are equal, but some primes are more equal than others.

See https://wychwoodschool.org/blogs/all-animals-are-equal-but-some-are-more-equal-than-others/ if you didn’t study English...

Forum: Miscellaneous Math

2021-08-24, 18:19

Replies: 39

More twin primes below Mersenne exponents than above Mersenne exponents.

Views: 4,845

Posted By drkirkby

I do laugh when I hear that Mathematica is now...

I do laugh when I hear that Mathematica is now supposed to be known as the Wolfram Language. Stephen really does have an ego.

Since version 10.4 in 2017, the function MersennePrimeExponent[]...

Forum: Miscellaneous Math

2021-08-24, 09:42

Replies: 39

More twin primes below Mersenne exponents than above Mersenne exponents.

Views: 4,845

Posted By drkirkby

The sequence of Mersenne prime exponents which...

The sequence of Mersenne prime exponents which are twin primes, is now A346645 on the online Encyclopedia of Integer Sequences website.

I only submitted Mathematica code to generate the sequence....

Forum: Miscellaneous Math

2021-08-18, 14:24

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

I don't know what "built a skyscraper" was...

I don't know what "built a skyscraper" was supposed to mean. All I wanted to do was benchmark testing exponents on my computer, using different amounts of RAM (8, 16 , 32, 64, 128, 256 and 320 GB),...

Forum: Software

2021-08-16, 16:38

Replies: 482

Prime95 v30.4/30.5/30.6

Views: 74,118

Posted By drkirkby

According to ...

According to

https://en.wikipedia.org/wiki/Direct.h
direct.h in a Windows file, but POSIX versions of some of the functions are in unistd.h. So something like the following has some chance of...

Forum: Miscellaneous Math

2021-08-15, 14:29

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

Oops, I'm not sure how I miscalculated that, to...

Oops, I'm not sure how I miscalculated that, to get more than 4x.

Forum: Miscellaneous Math

2021-08-15, 10:18

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

A lot can happen in the computer world in 2...

A lot can happen in the computer world in 2 years. You have two competing manufacturers (AMD and Intel) both with big R&D and marketing departments.

Yes, because most people can see it's better...

Forum: Miscellaneous Math

2021-08-14, 22:49

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

I personally don't feel you are being fair to Ben...

I personally don't feel you are being fair to Ben to ask him to run your exponents. You could easily drive him away from GIMPS if you pester him too much. I expect if you got lucky (and it would be...

Forum: Miscellaneous Math

2021-08-11, 23:04

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

Because sometimes it is faster. I only two CPUs,...

Because sometimes it is faster. I only two CPUs, but on 105 M exponents, 4 workers is significantly better than 2 workers. That's why the benchmark exists. Run it with 1, 2, 3 and 6 workers, and see...

Forum: Data

2021-08-11, 21:43

Replies: 30

P-1 benchmarking results in me getting cat 4 assignments

Views: 4,187

Posted By drkirkby

Agreed, although if doing GIMPS work, I would...

Agreed, although if doing GIMPS work, I would like to get involved somewhat in the project, rather than just pay the electric bill on a computer that runs 24/7 for GIMPS work, but only needed to run...

Forum: Miscellaneous Math

2021-08-11, 21:27

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

It looks from your screenshot as if you are using...

It looks from your screenshot as if you are using 1 worker. Have you actually verified you get best throughput on those crazy big exponents with one worker? I find I get best throughput with 4...

Forum: Data

2021-08-11, 11:36

Replies: 30

P-1 benchmarking results in me getting cat 4 assignments

Views: 4,187

Posted By drkirkby

I don't refuse to do P-1 or trial factoring. But...

I don't refuse to do P-1 or trial factoring. But it is pointless doing trial-factoring on my CPUs, as GPUs are far more sensible for trial-factoring. I've done a little trial-factoring on my GPU, but...

Forum: Hardware

2021-08-10, 17:23

Replies: 23

Reducing electric power ?

Views: 3,327

Posted By drkirkby

I have not used cudalucas, but GpuOwl ...

I have not used cudalucas, but GpuOwl
https://mersenneforum.org/forumdisplay.php?f=171
will do LL and PRP tests with an Nvidia card. But I found on my mid-range card, an Nvidia Quadro P2200 75 W...

Forum: Miscellaneous Math

2021-08-05, 00:29

Replies: 576

Getting others to do the work on exponents I like (was: Trial Factoring Progress)

Views: 72,051

Posted By drkirkby

I'm reliably informed that AMD are also working...

I'm reliably informed that AMD are also working on the development of another CPU which will launch next year. That will have 128 MB of level 4 cache using write only memory. I can't remember the...

Forum: Data

2021-08-04, 14:55

Replies: 30

P-1 benchmarking results in me getting cat 4 assignments

Views: 4,187

Posted By drkirkby

Yes, I can understand you could see it as gaming...

Yes, I can understand you could see it as gaming the credits system, but that was not the intention. Common sense would dictate doing P-1 factoring on different exponents would give credit. I...

Forum: Data

2021-08-03, 22:50

Replies: 30

P-1 benchmarking results in me getting cat 4 assignments

Views: 4,187

Posted By drkirkby

I've had four assignments, which were assigned as...

I've had four assignments, which were assigned as category 0, on the same machine at the same time. It was not that hard to do, but the difference in time to test a category 0 vs category 1...

Forum: Data

2021-08-03, 22:35

Replies: 30

P-1 benchmarking results in me getting cat 4 assignments

Views: 4,187

Posted By drkirkby

Since, for reasons I can't possibly comprehend,...

Since, for reasons I can't possibly comprehend, you want to work in the 168 million range, you could put in prime.txt
MinExponents=168000000
MaxExponents=169000000
Then the server will give you...

Forum: Software

2021-08-02, 18:39

Replies: 482

Prime95 v30.4/30.5/30.6

Views: 74,118

Posted By drkirkby

Was that comment really necessary? I've...

Was that comment really necessary?

I've been on a large number of forums in my years on the internet, including two maths related

I did a huge amount of work in porting the SageMath...

Forum: Data

2021-08-02, 18:18

Replies: 30

P-1 benchmarking results in me getting cat 4 assignments

Views: 4,187

Posted By drkirkby

P-1 benchmarking results in me getting cat 4 assignments

I was doing some P-1 benchmarking of my computer on this exponent

https://www.mersenne.org/report_exponent/?exp_lo=105211111&full=1

and needed to repeat a few tests. The server reported the...

Forum: Software

2021-08-02, 16:38

Replies: 482

Prime95 v30.4/30.5/30.6

Views: 74,118

Posted By drkirkby

Thank you. The linux64/makefile only contains ...

Thank you. The linux64/makefile only contains
FACTOROBJ = factor64.oso does not have enough information to build factor64.o from factor64.asm, which is in prime95/factor64.asm. I thought that file...

Forum: Software

2021-08-01, 22:49

Replies: 482

Prime95 v30.4/30.5/30.6

Views: 74,118

Posted By drkirkby

I assume it is an oversight, but in the source...

I assume it is an oversight, but in the source distribution of version 30.6b4, there's no assembly code for factor64 on linux. There's an object file (factor64.o), and assembly code for other...

Forum: Lounge

2021-07-31, 21:17

Replies: 915

You just might be addicted to GIMPS if...

Views: 99,719

Posted By drkirkby

Thank you. I was well ****ed off when I read the...

Thank you. I was well ****ed off when I read the comment from Uncwilly. I thought the thread was suppose to be a bit of fun. There are of course umpteen references to the number of computers people...

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